| abstract |
PROBLEM TO BE SOLVED: To easily and inexpensively separate and remove chlorine ions contained in a sulfate solution of a non-ferrous metal such as nickel sulfate and reduce it to a very small level desired for applications such as electronic materials and catalyst materials. Provide a method. SOLUTION: At least one of metallic silver, silver oxide, or silver sulfate or carbonate is added to a sulfate solution containing chlorine, and chlorine ions in the solution are precipitated and removed as silver chloride. Excess silver ions remaining in the solution can be removed by a cementation method. In addition, the silver chloride that has been removed by precipitation can be reacted with an alkaline solution to regenerate the silver oxide, and the resulting silver oxide can be repeated in the chlorine ion removal step. [Selection figure] None |